Hi,
this site has a strange behavior in the combination of pages numbers in the URL and the action of the buton "Load More".
I am not sure that my test is academic, but I achieved the scrapping of 21 projets by:

ajusting the delays (to short the scrapping )

modifying the name of the label of the selector concerning the button "Load More"

ajusting the range [1-2] in the metadata.

I suppose you need to test more to check the way of proceding of my sitemap: